Chair with waist rest and armrests

ABSTRACT

A chair with waist rest and armrests comprises a connecting element, a seat assembly, a chair back, a waist rest assembly, two armrest assemblies, a height adjusting apparatus and a leg assembly. The chair can be produced by a small number of simple components to include waist rest assembly and armrest assemblies, thus reducing the cost in production and assembly

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a combined chair, and more particularly to a chair with waist rest and armrests.

2. Description of the Prior Art

The existing chairs (for example office chairs) are normally provided with a seat, a chair back and a leg assembly. The seat is disposed on the leg assembly, and the chair back is connected to the seat. In addition, to satisfy requirements of users of different heights, between the seat and the leg assembly is disposed a height adjusting device. Furthermore, to enhance the seating comfort, the chairs are provided with armrest assemblies for supporting arms and a waist rest assembly for supporting waist.

However, when the chair only includes the seat, the chair back and the leg assembly, the components of the chair and the corresponding assembly are relatively easy, but once the chair is further provided with the armrest assemblies and the waist rest assembly, the components of the chair are complicated and the assembly cost is greatly increased.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a chair with waist rest and armrests which can reduce the cost in production and assembly since it only comprises a small number of simple components.

Hence, to achieve the above objective, a chair with waist rest and armrests in accordance with the present invention comprises a connecting element, a seat assembly, a chair back, a waist rest assembly, two armrest assemblies, a height adjusting apparatus, and a leg assembly. The connecting element includes a main body, two tube portions disposed at both sides of the main body, and two cylinder portions which are disposed at both sides of the main body between the two tube elements. The seat assembly includes a cushion body disposed on an upper end surface of the main body of the connecting element, and a loading plate which is disposed on a lower end surface of the main body of the connecting element and locked to the cushion body. The chair back includes a back rest plate, and two tube elements which are connected to the back rest plate and engaged on the two cylinder portions of the connecting element. The waist rest assembly includes a support element and a waist rest assembly plate, the support element is locked between the two tube elements of the chair back and includes two locking portions to be used to lock the tube elements and the cylinder portions, and a middle portion between the two locking portions. The waist rest assembly plate is disposed on the middle portion. The two armrest assemblies are inserted into the respective tube portions of the connecting element. The height adjusting apparatus includes an outer tube, and an inner tube which is connected to the loading plate and inserted in the outer tube in a liftable manner. The leg assembly is connected to the outer tube of the height adjusting apparatus.

Preferably, the cushion body includes a seat plate which is disposed on the upper end surface of the main body and locked to the loading plate, and a soft cushion engaged on the seat plate.

Preferably, the loading plate, the main body and the seat plate are locked together through screws.

Preferably, the locking portions of the support element, the tube elements of the chair back and the cylinder portions of the connecting element are locked together through screws.

Preferably, a curved elastic portion is connected between the respective two locking portions and the middle portion of the support element of the waist rest assembly.

Preferably, the middle portion of the support element of the waist rest assembly includes hollow cylinders, and the waist rest assembly plate of the waist rest assembly includes protruding cylinders to be inserted into the hollow cylinders of the support element.

Preferably, the loading plate of the seat assembly includes an insertion portion for insertion of a top end of the inner tube of the height adjusting apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a chair with waist rest and armrests in accordance with the present invention, showing that the respective components are separated;

FIG. 2 is a perspective view of the chair with waist rest and armrests in accordance with the present invention, showing that the respective components are combined;

FIG. 3 is an exploded view of the present invention, showing that the connecting element and the seat assembly are separated;

FIG. 4 is a cross-sectional view of the present invention, showing that the connecting element is combined to the seat assembly;

FIG. 5 is an exploded view of the present invention, showing the chair back and the waist rest assembly are separated;

FIG. 6 is a cross-sectional view of the present invention, showing that part of the connecting element, part of the chair back and the waist rest assembly are combined;

FIG. 7 is an exploded view of the present invention, showing the armrest assemblies, the height adjusting apparatus are separated; and

FIG. 8 is a cross sectional-view of the present invention, showing the height adjusting apparatus and the seat assembly are combined.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.

Referring to FIGS. 1-8, a chair with waist rest and armrests in accordance with a preferred embodiment of the present invention comprises a connecting element 10, a seat assembly 20, a chair back 30, a waist rest assembly 40, two armrest assemblies 50, a height adjusting apparatus 60 and a leg assembly 70.

The connecting element 10 includes a main body 11, two tube portions 12 disposed at both sides of the main body 11, and two cylinder portions 13 which are disposed at both sides of the main body 11 between the two tube portions 12.

The seat assembly 20 includes a cushion body 21 disposed on an upper end surface of the main body 11 of the connecting element 10, and a loading plate 22 which is disposed on a lower end surface of the main body 11 and locked to the cushion body 21. The loading plate 22 includes an insertion portion 221. The cushion body 21 includes a seat plate 211 which is disposed on the upper end surface of the main body 11 and locked to the loading plate 22, and a soft cushion 212 disposed on the seat plate 211. The loading plate 22, the main body 11 and the seat plate 211 are locked through screws 81. The seat assembly 20 is combined as shown in FIG. 4.

The chair back 30 includes a back rest plate 31, and two tube elements 32 which are connected to the back rest plate 31 and engaged on the two cylinder portions 13 of the connecting element 10.

The waist rest assembly 40 includes a support element 41 and a waist rest assembly plate 42. The support element 41 is locked between the two tube elements 32 of the chair back 30 and includes two locking portions 411 to be used to lock the tube elements 32 and the cylinder portions 13 through two screws 82, and a middle portion 412 between the two locking portions 411. Between the respective two locking portions 411 and the middle portion 412 is connected a curved elastic portion 413. The middle portion 412 includes two hollow cylinders 414. The waist rest assembly plate 42 includes two protruding cylinder 421 to be locked into the hollow cylinders 414 by screws 83, so that the waist rest assembly plate 42 can be fixed on the middle portion 412 of the support element 41. The waist rest assembly 40 is combined as shown in FIG. 6.

The two armrest assemblies 50 are inserted into the respective tube portions 12 of the connecting element 10 and can be adjusted in height as desired. Since the height adjustment of the armrest assemblies 50 is the conventional art, no further explanation is provided herein.

The height adjusting apparatus 60 includes an outer tube 61, and an inner tube 62 which is connected to the loading plate 22 of the seat assembly 20 and inserted in the outer tube 61 in a liftable manner. The inner tube 62 has its top end inserted into the insertion portion 221 of the loading plate 22. The height adjusting apparatus 60 is an air pressure bar. The loading plate 22 is provided with an operating rod 63 for adjusting the height of the seat assembly 20 by operating the outer tube 61 and the inner tube 62. Since the height adjusting apparatus 60 is conventional, no further explanation is provided herein. The height adjusting apparatus 60 is combined as shown in FIG. 8.

The leg assembly 70 is connected to the outer tube 61 of the height adjusting apparatus 60.

The aforementioned is the summary of the positional and structural relationship of the respective components of the preferred embodiment in accordance with the present invention.

For a better understanding of the present invention, its operation and function, reference should be made to the following description:

To assemble the chair of the present invention, it only needs to lock the seat assembly 20, the chair back 30 and the waist rest assembly 40 to the connecting element 10 first, and then the respect armrest assemblies 50 will be inserted into the tube portions 12 of the connecting element 10, and the height adjusting apparatus 60 will be assembled to the loading plate 22 of the seat assembly 20, and finally, the leg assembly 70 will be combined to the height adjusting apparatus 60, thus finishing the assembly of the chair of the present invention. Hence, it can be found that the assembly of the present invention is quite simple, thus reducing the assembly cost. During the assembling process, the chair back 30, the waist rest assembly 40 and the connecting element 10 can be synchronously locked by a screwing operation as shown in FIG. 6, consequently, indeed reducing the assembly cost of the chair with waist rest and armrests of the present invention.

It is to be noted that, the chair of the present invention comprises the connecting element 10, the seat assembly 20, the chair back 30, the waist rest assembly 40, the two armrest assemblies 50, the height adjusting apparatus 60 and the leg assembly 70, the waist rest assembly 40 includes the support element 41 and the waist rest assembly plate 42, and the armrest assemblies 50 are available in the market, so that the chair with waist rest and armrests in accordance with the present invention only comprises a small number of simple components, thus reducing the cost in production and assembly.

While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention. 

1. A chair with waist rest and armrests comprising: a connecting element including a main body, two tube portions disposed at both sides of the main body, two cylinder portions which are disposed at both sides of the main body between the two tube elements; a seat assembly including a cushion body disposed on an upper end surface of the main body of the connecting element, and a loading plate which is disposed on a lower end surface of the main body of the connecting element and locked to the cushion body; a chair back including a back rest plate, and two tube elements which are connected to the back rest plate and engaged on the two cylinder portions of the connecting element; a waist rest assembly including a support element and a waist rest assembly plate, the support element being locked between the two tube elements of the chair back and including two locking portions to be used to lock the tube elements and the cylinder portions, and a middle portion between the two locking portions, the waist rest assembly plate being disposed on the middle portion; and two armrest assemblies being inserted into the respective tube portions of the connecting element; a height adjusting apparatus including an outer tube, and an inner tube which is connected to the loading plate and inserted in the outer tube in a liftable manner; and a leg assembly being connected to the outer tube of the height adjusting apparatus.
 2. The chair with waist rest and armrests as claimed in claim 1, wherein the cushion body includes a seat plate which is disposed on the upper end surface of the main body and locked to the loading plate, and a soft cushion engaged on the seat plate.
 3. The chair with waist rest and armrests as claimed in claim 2, wherein the loading plate, the main body and the seat plate are locked together through screws.
 4. The chair with waist rest and armrests as claimed in claim 1, wherein the locking portions of the support element, the tube elements of the chair back and the cylinder portions of the connecting element are locked together through screws.
 5. The chair with waist rest and armrests as claimed in claim 1, wherein a curved elastic portion is connected between the respective two locking portions and the middle portion of the support element of the waist rest assembly.
 6. The chair with waist rest and armrests as claimed in claim 1, wherein the middle portion of the support element of the waist rest assembly includes hollow cylinders, and the waist rest assembly plate of the waist rest assembly includes protruding cylinders to be inserted into the hollow cylinders of the support element.
 7. The chair with waist rest and armrests as claimed in claim 1, wherein the loading plate of the seat assembly includes an insertion portion for insertion of a top end of the inner tube of the height adjusting apparatus. 